Valve-gear.



-0 A. 'DONATH. V LVE GEAR.

APPLICATION FILED AUG. 21,.1911.

1,01 5",' 792. v v Patented Jan.30,19l2. Y

Inventor,

y I I- Attorneys,

OTTO A. nonnrn or SEDALIA, MISSOURI.

VALVE-GEAR.

Specification of Letters Patent.

Patented Jan. 30, 1912.

Application filed August 21, 1911. Serial No. 645,100.

To all whom it may concern:

Be it known that I, OTTO A. DONATE, a citizen of the United States,residing at Sedalia, in the county of Pettis and'State of Missouri, haveinvented a new and useful Valve Gear, of which the following is aspecification.

This invention relates to valve gears for use in connection with steamengines and its principal object is to provide mechanism of this typehaving fewer parts than other mechanisms of a similar nature heretoforedevised, the simplicity of the structure being thus materially increasedwithout, however, reducing the efficiency of the gears.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes'in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings :Figure 1 is a side elevation of a portion of alocomotive having applied thereto the valve gear constituting thepresent invention. Fig. 2 is a plan view of parts shown in Fig. 1.

Referring to the figures by characters of reference 1 designates aportion, of the locomotive frame and a guide yoke or bracket 2 ismounted thereon and supports one end portion of a guide rail 3. Theother end portion of this rail is supported by a yoke or bracket 4connected to the locomotive frame in any suitable manner.

The cylinder of the engine has been indicated at 5 and its steam chestat 6. Guides 7 extend from the cylinder and a cross head 8 is mounted toreciprocate therebetween, this cross head being connected to the pistonrod 9 as ordinarily, and also to a pitman, not shown.

The front and rear drive wheels have been indicated at 10 and 11respectively, and the cranks 12 and 13 of these wheels are connected, asordinarily, by a side rod 14. The wrist pin 15 on the crank 13 has asupplemental crank 16 secured to it and extending toward the center ofthe wheel 11. An eccentric rod 17 has its long arm mounted upon thesupplemental crank 16 while its short arm is pivotally attached to alever 18 arranged outside of and extending across the side rod 14. Inthe form of the device shown in the drawing the upper end of lever 18 ispivotally connected, as at 19, to a cross head 20 which is slidablymounted on the guide 3 and is secured to the valve stem 21.

A reversing shaft 22 is journaled at each end on a lever 22 the long armof which is supported by the journal boX of wheel 11 while its short armis pivoted to the frame of the locomotive. This shaft has a crank arm 23to the free end of which is pivoted one end of a link 24. The otherendof the link is pivotally connected, as at 25, to the meeting ends oftoggle links 26 and 27, link 26 being pivotally connected to lever 18 asindicated at 28 while link 27 is pivotally connected to rod 17, asindicated at 29. An arm 30 is extended radially from the shaft 22 andhas a rod 31 attached to it whereby motion may be transmitted to saidarm. and to the shaft 22 from a suitable reversing lever not shown.

It is to be understood that in a locomotive structure shaft 22 is to beprovided at each end with an arm 23 and that valve gears such asheretofore described... are to be located at both sides ofthelocomotive, one of the crank arms 23 being coupled to each of the valvegears in the manner set forth. Obviously, therefore, rotation of shaft22 will result in the simultaneous actuation of both valve gears.

With the parts arranged as illustrated in Fig. 1 the drive wheel 11,when rotating, will impart a combined oscillatory and reciprocatorymovement to the rod 17 with the result that lever 18 will be oscillatedabout the pivot 28 as its fulcrum, and thus cause cross head 20 toreciprocate upon the guide 3 and cause desired movement of the valvewithin the steam chest 6. When it is desired to reverse the engine,shaft 22 is rotated so as to cause the crank arms 23 to push the link 24upwardly and rearwardly against the connected ends of the toggle links.This will result in bodily shifting lever 18 and causing the cross head20 to move along guide 3 to its new position. Said cross head willcontinue to work as before during the actuation of the rod 17 It is tobe understood that the parts located at the two sides of the locomotiveare exact duplicates and it is thus unnecessary to make rights and leftsin order to combine the improvements with the valves of the twocylinders of the locomotive.

The parts of the gear have been shown in the drawings arranged for usein connection with an outside admission valve.

.Where the gear is to be used with an inis thus much more simple andefiicient.

By mounting the reversing shaft 22 upon levers 22 which bear at theirrear ends upon the boxes of the wheels 11, it will be seen that themovements of the links, etc., relative to the locomotive frame while there-- versing shaft is locked against rotation, is,

reduced to the minimum and there is no danger of the valve becomingdisplaced during the up and down movement of the wheels 11 relative tothe frame 1.

What is claimed is 1. Valve gearing including a valve cross head, areversing shaft, a crank arm upon said shaft, a, link connected tovandactuated by the crank arm, an eccentric rod, a lever pivotally connectedto said rod and to the cross head, a link connection between the rod andthe link on the crank arm, and a link connection betweenthe lever andsaid crank arm link.

2. Valve gearing including a valve cross head, a lever pivotallyconnected thereto an eccentric rod pivotally connected to the lever, areversing shaft a crank arm thereon,

Copies 01' this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

a link connected to the crank arm, and toggle links connecting said linkto the lever and eccentric rod respectively.

3. The combination with a drive wheel having a crank, of a supplementalcrank carried by said first mentioned crank, an eccentric rod connectedto and actuated by the supplemental crank, a valve cross head, a leverconnecting the rod and cross head, a reversing shaft, a crank armthereon, a toggle connection between the lever and eccentric rod, and alink connection between the toggle and the crank arm.

4. Valve gearing including a valve cross head, a lever pivotallyconnected thereto an eccentric rod pivotally connected to the lever, areversing shaft, a crank arm thereon, a link connected, to the crankarm, toggle links connecting said link to the lever and eccentric rodrespectively, levers pivotally connected at one end to the frame of asup porting structure, the other ends of said levers being adaptedtobear upon the jour-- nal boxes of drive wheels, and bearings upon thelevers and engaged by the reversing shaft.

5. The combination with a frame, and drive wheels, of valve gearingincluding a valve cross head, a lever pivotally connected thereto, aneccentric rod pivotally connect ed to the lever, levers fulcrumed at oneend upon the frame and hearing at their other end upon the journal boxesof the, drive wheels, a reversing shaft journaled upon the lastmentioned levers, a crank arm there on, a link connected to the crankarm, and toggle linksconnecting said link to the lever and eccentric rodrespectively.

In testimony that I claim the foregoing as my own, Ihave hereto afliXedmy signature in the presence of two witnesses.

oTTo A. DONATH; Witnesses HERBERT D. LAWSON, FRANK B. OOHSENREITER.

Washington, D. G.

